Activities panel is blank if there are too many revisions

Please describe what you are doing to trigger the bug:
Browser: Firefox
Web edition version: 1.4.1
CLI version: 2.7.2

My scheduled backup commands run every 15 minutes. Normally my PC is on for at most 10 hours or so, so at most there’s around 40 revisions per day. The activities panel on the dashboard in the web ui never had any issues in that scenario. Since a couple of a days my machine has been on non-stop, resulting in the new peak being almost 100 revisions per day.

Please describe what you expect to happen (but doesn’t):
The activities panel keeps working.

Please describe what actually happens (the wrong behaviour):
The activities panel is blank. If the panel is inspected using the developer tools in the browser, the individual elements representing the different revisions are still there (see screenshot), they’re just not visible anymore.

If the page is zoomed in to 110% using CTRL-+, the activities reappear.

If you zoom back out to 100% using CTRL--, the contents remain.

If you hit F5 to refresh the page, the panel becomes blank again.

The Firefox version is 84.0.1. The exact same behavior reproduces in Chrome 87.0.4280.88. Resolution is 1920x1080.